It is definitely not legal tender. As a Chinese, I've only ever seen such things in tourist souvenir shops for foreigners. If your argument is that a €4000 souvenir is questionable, please allow me to remind you that a €4000 currency coin makes no more sense. If your source is this webpage: https://www.kjc-gold-silver-bullion.com.au/PD/30-g-2023-chin..., I can be almost certain it's a scam because its description is ridiculous.
Bullion coins are typically marked as 'legal tender' (of a nominal value relative to the precious metal content) as doing so exempts them from sales tax in most jurisdictions..... because they are technically "legal tender" (coins) and not bullion.
e.g. British sovereigns are still produced and have a "legal tender" value of £1. Though the gold content of one is currently about £800 last I looked.
> As a Chinese, I've only ever seen such things in tourist souvenir shops for foreigners
Huh, none of these coins are in general use in any country because it would make no sense (their facial value is always largely below their metal value, which is basically constantly appreciating). As a French person I have never seen 20 francs coins in circulation either, and I wouldn't by my baguette with one, but they are still obviously not a "scam", even if their actual value doesn't match their face value. I mean, I should know since I actually buy them, manipulate them, and use them for their gold content.
I think you don't understand how these gold coins work, honestly I don't claim I really understand why central banks produce them either, but they do exist and they seem like a convenient way to invest in real gold (and here comes my initial remark: but why choose the ones that sell for a premium as compared to the ones that sell just for their weight in gold, that I don't understand).
